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CVE-2026-6740— Nexter Blocks <= 4.7.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'commentIcon' Block Attribute

Quick assessment

Affected
posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Nexter Blocks是WordPress基金会的一系列Gutenberg区块扩展插件。 WordPress Nexter Blocks 4.7.4及之前版本存在跨站脚本漏洞，该漏洞源于对'commentIcon'参数的输入清理和输出转义不足，导致容易受到存储型跨站脚本攻击，使得认证攻击者（具有贡献者级别及以上权限）能够在页面中注入任意Web脚本，当用户访问被注入的页面时脚本会被执行。

CVSS 6.4 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder ≤ 4.7.4 affected
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I. Basic Information for CVE-2026-6740

Vulnerability Information
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Vulnerability Title
Nexter Blocks <= 4.7.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'commentIcon' Block Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'commentIcon' parameter in all versions up to, and including, 4.7.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Nexter Blocks 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Nexter Blocks是WordPress基金会的一系列Gutenberg区块扩展插件。 WordPress Nexter Blocks 4.7.4及之前版本存在跨站脚本漏洞，该漏洞源于对'commentIcon'参数的输入清理和输出转义不足，导致容易受到存储型跨站脚本攻击，使得认证攻击者（具有贡献者级别及以上权限）能够在页面中注入任意Web脚本，当用户访问被注入的页面时脚本会被执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder 0 ~ 4.7.4 -

II. Public POCs for CVE-2026-6740

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III. Intelligence Information for CVE-2026-6740

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Patches & Fixes for CVE-2026-6740 (1)

Security Blog Posts for CVE-2026-6740 (1)

IV. Related Vulnerabilities

Same product: Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
Same vendor: posimyththemes
Same weakness: CWE-79

V. Comments for CVE-2026-6740

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